home *** CD-ROM | disk | FTP | other *** search
- #!/bin/sh
- #
- # Copyright (c) 1990, by John Robert LoVerso.
- # All rights reserved.
- #
- # Redistribution and use in source and binary forms are permitted
- # provided that the above copyright notice and this paragraph are
- # duplicated in all such forms and that any documentation,
- # advertising materials, and other materials related to such
- # distribution and use acknowledge that the software was developed
- # by John Robert LoVerso.
- # THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- # IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- # WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- #
- # @(#) $Id: makemib,v 2.1 90/07/10 23:51:54 loverso Exp Locker: loverso $ (jlv
- )
-
- #
- # This script will read either ASN.1-style MIB files or the ".defs" files
- # created by the ISODE "mosy" program on such files.
- #
- # The output of this script is the "mib.h" file used by tcpdumps' ASN.1/SNMP
- # decoding code.
- #
- # This script needs to be run by "gawk" (GNU awk). "nawk" will work, but
- # dump will get a recursion error if you process LARGE mibs. While it would
- # by farily easy to rewrite this not to use recursion (and also easy to
- # eliminate use of gsub and functions to use classic "awk"), you have to
- # order the structure declarations in defined-first order for the compiler
- # not to barf; too bad tsort doesn't take arguments.
- #
-
- cat << EOF
- /*
- * This file was generated by tcpdump/makemib on `date`
- * You probably don't want to edit this by hand!
- *
- * struct mib somename = { desc, oid-octet, type, child-pointer, next-pointer
- };
- */
-
- EOF
-
- # use sed to make the ASN.1 easier to parse
- # I should really just use a recursive descent parser in awk, but...
- sed \
- -e 's/--\*.*\*--//' \
- -e 's/--.*//' \
- -e 's/\([{}]\)/ \1 /g' \
- $@ \
- | gawk '
- BEGIN {
- # for sanity, we prep the namespace with objects from RFC-1155
- # (we manually establish the root)
- oid["iso"]=1
- oidadd("org", "iso", 3)
- oidadd("dod", "org", 6)
- oidadd("internet", "dod", 1)
- oidadd("directory", "internet", 1)
- oidadd("mgmt", "internet", 2)
- oidadd("mib", "mgmt", 1)
- oidadd("experimental", "internet", 3)
- oidadd("private", "internet", 4)
- oidadd("enterprises", "private", 1)
-
- holddesc="none"
- }
-
- #
- # Read mosy "*.defs" file. mosy does all the parsing work; we just read
- # its simple and straightforward output. It would not be too hard to make
- # tcpdump directly read mosy output, but...
- #
-
- NF > 1 && index($2,".")>0 {
- # currently ignore items of the form "{ iso.3.6.1 }"
- if (split($2, p, ".") == 2)
- oidadd($1, p[1], p[2])
- next
- }
-
- #
- # this next section is simple and naive, but does the job 100%
- #
-
- $2$3$4 == "OBJECTIDENTIFIER::=" {
- holddesc="none"
- if (NF == 8)
- oidadd($1, $6, $7)
- }
- $2 == "OBJECT-TYPE" {
- holddesc=$1
- }
- $1 == "::=" && holddesc != "none" && NF == 5 {
- oidadd(holddesc, $3, $4)
- holddesc="none"
- }
-
- #
- # End of the road - output the data.
- #
-
- END {
- print "struct obj"
- dump("iso")
- print "*mibroot = &_iso_obj;"
- }
-
- #
- # add a new object to the tree
- #
- # new OBJECT IDENTIFIER ::= { parent value }
- #
-
- function oidadd(new, parent, value) {
- # use safe C identifiers
- gsub(/[-&\/]/,"",new)
- gsub(/[-&\/]/,"",parent)
- # check if parent missing
- if (oid[parent] == 0) {
- printf "/* parse problem: no parent for %s.%s(%d) */\n", \
- parent, new, value
- return
- }
- # check if parent.value already exists
- if (oid[new] > 0 && oid[new] != value) {
- printf "/* parse problem: dup %s.%s(%d) != old (%d) */\n", \
- parent, new, value, oid[new]
- return
- }
- # check for new name for parent.value
- if (child[parent] != "") {
- for (sib = child[parent]; sib != ""; sib = sibling[sib])
- if (oid[sib] == value) {
- printf "/* parse problem: new name \"%s\"" \
- " for %s.%s(%d) ignored */\n", \
- new, parent, sib, value
- return
- }
- }
-
- oid[new]=value
- if (child[parent] == "") {
- child[parent] = new
- } else {
- sibling[new] = child[parent]
- child[parent] = new
- }
- }
-
- #
- # old(?) routine to recurse down the tree (in postfix order for convenience)
- #
-
- function dump(item, c, s) {
- # newitem=sofar"."item"("oid[item]")"
- # printf "/* %s c=%s s=%s */\n", newitem, child[item], sibling[item]
- c="NULL"
- if (child[item] != "") {
- dump(child[item])
- c = "&_"child[item]"_obj"
- }
- s="NULL"
- if (sibling[item] != "") {
- dump(sibling[item])
- s = "&_"sibling[item]"_obj"
- }
- printf "_%s_obj = {\n\t\"%s\", %d, 0,\n\t%s, %s\n},\n", \
- item, item, oid[item], c, s
- }
- '
- exit 0
-